Rotary compressor



Jan. I, 1935. M. W, LEE

ROTARY COMPRESSOR 5 Sheet-Sheet 1 Filed Dec. 12, 1952 witnesses W 6 W lrxlmviawvcsm.

1935- M. w. LEE 1,986,272

ROTARY COMPRES SOR Filed Dec. 12, 1932 3 Sheets-Sheet 2 wimeascs mfg Jan. 1, 1935. M. w. LEE 1,986,272

ROTARY CQMPRESSOR Fiied Dec. l2, 1932 3 Sheets-Sheet s wi'rrzesaes Patented Jan. 1, 1935 UNITED STATES PATENT OFFICE- ROTARY COMPRESSOR Maurice William Lee, Nashville, Tenn.

Application December 12, 1932, Serial No. 646,922

3 Claims. (01. 230-440) as are used for the compression of refrigerants in household refrigerating machines. It has as an object the provision of a machine wherein and cylinder and tightening said screws.

the compressor mechanism operates within the armature of the motor, thus making possible hermetic sealing of the motor and compressor in one unit and preventing any possible escapaef the refrigerant by way of the conventional shaft packing. It has as a further object the provision of a rotary type compressor, having a mechanism operable without spring means. Another object is to reduce friction to a minimum. These and other objects are attained by the mechanism hereinafter described and illustrated in the accompanying drawings in which:

Fig. 1 is a front elevation with the side plate removed,

Fig. 2 is a side elevation, half sectioned,

Fig. 3 is an oblique drawing of the motor armature with the compressor mechanism assembled therein,

Fig. 4 is a fragmentary view disclosing the manner of joining the blade to the cylinder.

Corresponding parts in the several figures are denoted by like characters of reference.

This invention comprises a motor, preferably of the induction type, having a shell 1, a field assembly 2, and a hollow armature 3. Fixedly mounted within the armature is a cylinder 4 which serves as a shaft for the motor armature and a cylinder for the compressor mechanism. Joined radially to the cylinder in a manner best disclosed in Figure 4, and brazed or welded therein, is a blade 5. Said blade 5 is reciprocable in a slot 6 in a cylindrical rod 7; the cylindrical rod 7 being movably mounted in a cylindrical piston 8 in a position so that their circumferences are tangent.

The cylindrical piston 8 is pivotally mounted by means of an anti-friction bearing 9 mounted in annular recesses 10, on pivots 11. Pivots 11 are secured by screws 12 to side plates 13. Holes 14 are so positioned in side plates 13, that the piston 9 is eccentric to cylinder wall 4 and contacts therewith, and also positioned eccentric to and larger than pivot screws 12 so that adjustment for wear on piston 8 and cylinder 4 may be accomplished by contacting said piston On each end of cylinder 7 and on opposite sides of blade 5 are slots 15 communicating between the working chambers and annular spaces 16. On each side of the compressor in side plates 13 are holes 17, communicating with annular spaces 16 and threaded to permit working connections.

The faces of easing 1 adjacent to side plates 13 are accurately machined so that a leak proof fit is obtained. Side plates 13 are secured to casing 1 by screws 18.

In operation it may be assumed for the purpose of explanation that the armature is rotating in a counter-clockwise direction as indicated by the arrow in Figure 1. The space between the rear face of the reciprocable blade 5 and the arc of contact made by the cylindrical piston 8 and the cylinder 4 shall be referred to as the intake chamber and the space between the forward edge of said reciprocable blade and said arc of contact shall be referred to as the compression chamber. Rotation of the armature causes the reciprocable blade 5 to carry the cylindrical piston 8 around its axis of rotation in the same direction. The cylinder '7 moves to correspond to the resulting change in radial relations hip of the reciprocable blade 5 and the radial positions of the cylindrical piston 8 as it is caused to rotate. As the piston rotates toward the arc of contact the reciprocable blade 5 advances into the slot 6 provided for same.

0n the first revolution a charge of gas is taken in through'the ports 17 on one end of the compressor and reaches the intake chamber by way of the annular space 16 and the slot 15. On the second revolution of the armature the previous charge of gas is compressed in the compression chamber and is forced out the slot 15 in the opposite end into the annular space 16 and through the port 17.

During the transition period when the pump is neither intaking or discharging, obturation of the compressed gas on the one hand and the gas being exhausted on the other hand is accomplished by the valving action between the passages 15 and the cylindrical piston 8. The rocker action of the pin 6 during the rotation of the pump causes the passage 15 to remain closed until there is a partial vacuum on the intake side of the cylinder and the gas partially compressed on the compression side of the cylinder. This valving action increases the emciency of the pump by preventing the backing up of the compressed gas and doing away with the necessity of a backing pump during the process of exhaustion as used in the production of high vacua.

In this disclosure only the preferred form of my invention is shown. Changes in the construction and arrangement of parts may be reblade reciprocable in said slot and rigidly se-' cured to said outer cylinder, annular channels in opposite ends or said cylindrical piston and slots or ducts on ends of said movable pin in proximity to and on opposite sides of said reciprocable blade, each communicating with said annular channels on opposite ends of said cylindrical piston which communicate respectively with inlet and outlet passages in said side plates.

2. In a machine for the exhaustion and compression of gases, an outer cylinder rotatably mounted between side plates, means provided for rotating said cylinder, a cylindrical pistdii eccentrically mounted within said cylinder and between said side plates and having a cylindrical hole longitudinal with the axis of said cylindrical piston, a movable pin in said hole having a longitudinal slot, a blade reciprocable in said slot and rigidly secured to said outer-cylinder, and slots or ducts in said movable pin communicating respectively with inlet and outlet passages in said side plates.

3. In a machine of the class described, a motor comprising a fleld assembly, a pair of end plates, an armature rotating within said field mounted between said end plates upon a hollow cylindrical shaft, a cylindrical piston eccentrically 15 mounted within said shaft having a cylindrical hole longitudinal with the axis of said piston, a movable pin in said hole having a longitudinal slot, a blade reciprocable in said slot and rigidly secured to said outer cylinder, annular channels in opposite ends of said cylindrical piston, and slots or. ducts in said movable pin communicating respectively with inlet and outlet passages in said end plates.

MAURICE WM. LEE. 

